Real load unbalance protection system for parallel variable spee

Details Real load unbalance protection system for parallel variable spee Real load unbalance protection system for parallel variable spee

1986-12-05

1988-03-15

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361 85, 307 56, 307 86, H02H 326

Patent

active

047316900

ABSTRACT:
A method for sensing real load unbalance in an electrical power system having at least two clock based power sources which are connected for parallel operation combines a real load difference current signal, proportional to the difference in real load currents in corresponding phases of the power sources, with a phase angle signal which is proportional to the phase difference between an external clock signal and an internal clock signal of one of the power sources, to produce an error signal. When this error signal exceeds a predetermined threshold level, a trip signal is produced to indicate that an excessive real load unbalance situation exists.

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